Considering the cost of a single event-based camera, classical 3d imaging approaches using two or more synchronized cameras may be cost-prohibitive. This work explores 3d imaging using a single stationary camera and a...
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Stereoscopic 3-ddisplay technologies aim to provide a compelling, realistic sense of 3-ddepth. Theoretically, this could be achieved by having a system that can project the same light rays coming from the real world...
Stereoscopic 3-ddisplay technologies aim to provide a compelling, realistic sense of 3-ddepth. Theoretically, this could be achieved by having a system that can project the same light rays coming from the real world via a display. Recent advances in rendering, display, andimageacquisition have made it possible to present almost all depth cues accurately. Focus cues, including the eye's focusing response to image blur (accommodation) and the pattern of retinal blur arising from objects at varying distances (retinal blur gradient), remain challenging to replicate accurately, however. In conventional stereoscopic displays, focus cues are incorrect, as the depth is specified by the screen surface and not by the position of the content in the scene. This issue causes two problems: firstly, the unnatural pattern of oculomotor responses elicited when viewing the 3-d scene (inaccurate accommodation signals), and the appearance (inaccurate retinal blur gradient) may signal the unnaturalness of depth in the scene (Hibbard et al., 2017). Secondly, the inconsistency between depth specified by vergence from disparity and focus cues results in a conflict commonly known as vergence-accommodation conflict. The visual system's effort to resolve this conflict causes visual discomfort and reduced stereoacuity (Watt et al., 2005 a; Hoffman et al., 2008; Shibata et al., 2011). There is an increasing demand for stereoscopic 3-ddisplays that can elicit realistic depth and have minimal to no user issues. Several technologies have tried to address the issue with incorrect focus cues, but all are computationally intensive, require specialist hardware, and compromise image quality. Hence, the value of presenting focus cues accurately needs to be fully understood. In Chapter 2, we measured the vergence distances (zone of good stereo depth perception) around the screen, where stereoscopic depth perception remains effective despite incorrect focus cues. To understand whether all users would
Current scene parsers have effectively distilled abstract relationships among refined instances, while overlooking the discrepancies arising from variations in scene depth. Hence, their potential to imitate the intrin...
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Current scene parsers have effectively distilled abstract relationships among refined instances, while overlooking the discrepancies arising from variations in scene depth. Hence, their potential to imitate the intrinsic 3dperception ability of humans is constrained. In accordance with the principle of perspective, we advocate first grading the depth of the scenes into several slices, and then digging semantic correlations within a slice or between multiple slices. Two attention-based components, namely the Scene depth Grading Module (SdGM) and the Edge-oriented Correlation Refining Module (EoCRM), comprise our framework, the Line-of-Sight depth Network (LoSdN). SdGM grades scene into several slices by calculating depth attention tendencies based on parameters with explicit physical meanings, e.g., albedo, occlusion, specular embeddings. This process allocates numerous multi-scale instances to each scene slice based on their line-of-sight extension distance, establishing a solid groundwork for ordered association mining in EoCRM. Since the primary step in distinguishing distant faint targets is boundary delineation, EoCRM implements edge-wise saliency quantification and association digging. Quantitative anddiagnostic experiments on Cityscapes, AdE20K, and PASCAL Context datasets reveal the competitiveness of LoSdN and the individual contribution of each highlight. Visualizations display that our strategy offers clear benefits in detecting distant, faint targets.
We report a miniature Fourier Lightfield Microscope, based on a cost-effective reversed surveillance camera lens and a contact field stop. The miniscope captures efficiently 3d information, in fluorescence or brightfi...
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We developed a versatile experimental setup able to characterize the optical performance of different 3ddisplaydesigns based on far-field (spot size, lateral color) and near-field (contrast, spatial resolution, MTF)...
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We demonstrate a high-speed optical diffraction tomography method with an unprecedented three-dimensional imaging speed of over 10,000 volumes per second anddiffraction-limited resolution and apply it for high-throug...
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Band-limited illumination profilometry (BLIP) is a reconfigurable phase-shifting fringe projection profilometry modality with a field-of-view of 1.7 m × 1.1 m and at a 3d imaging speed of up to 1200 frames per se...
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